Isolated networking

[pablofrommars]

Thanks for your work, this has been very valuable already.

Apologies if this is off topic as it is more a question than an actual issue. I would like to be able to create an isolated network for multiple containers running on the same host along side zerotier-docker. Basically sharing the interface created by your image to a group of containers. Is this a use case you have experimented with before?

[zyclonite]

i have not tried that before but i would play with iptables on the host to forward packages between the docker network and the zt interface

[zyclonite]

i guess that's possible now with the -router tag of this container, you can simply create a container network and have one zerotier container as a gateway routing only into this virtual network

[Paraphraser]

Rather than open a new issue, I'll just mention here that the main page on DockerHub probably needs updating too.

[zyclonite]

true, i will update it

[PovilasID]

I have taken a slightly different approach.

1. Removing --net=host so the container gets isolated inside of its own network
2. Change default port to away from 9993 to avoid collisions if running multiple instances.
   Add volume ./zerotier_config:/var/lib/zerotier-one and inside of it create file local.conf and add:

{
  "settings": {
    "primaryPort": 9997
  }
}

3. In another container that needs access to ZT network set network_mode: container:zerotier_container_name (this step can differ)
   This way you can have multiple ZT containers running with access to different networks without exposing these networks to the host.

[airtonix]

@PovilasID cheers.

---
version: "3.8"

services:
  arma-reforger:
    image: ghcr.io/acemod/arma-reforger:latest
    platform: linux/amd64
    # left here for posterity
    # ports:
    #   - "2001:2001/udp"
    #   - "17777:17777/udp"
    #   - "19999:19999/udp"

    volumes:
      - ./reforger/configs:/reforger/Configs
      - ./reforger/profile:/home/profile
      - ./reforger/workshop:/reforger/workshop

    environment:
      - ARMA_CONFIG
      - SERVER_PUBLIC_ADDRESS

    network_mode: service:zerotier

  zerotier:
    image: zyclonite/zerotier:latest
    cap_add:
      - NET_ADMIN
      - SYS_ADMIN
    devices:
      - /dev/net/tun
    volumes:
      - ./zerotier:/var/lib/zerotier-one

preparation zerotier:

1. create an empty file ./zerotier/networks.d/YOUR_NETWORK_ID.conf
2. create a file ./zerotier/local.conf with content

{
  "settings": {
    "primaryPort": 9997
  }
}

3. docker compose run zerotier
4. login to zerotier
5. auth the new connection
6. vis the provided IP address as SERVER_PUBLIC_ADDRESS

preparation arma reforger

1. start Arma Reforger (the client) > Multiplayer > Host
2. pick mods
3. set public and bind ip address to same as #4
4. press Save (note the saved file) as ARMA_CONFIG
5. move that file to ./reforger/configs/

start:

1. ARMA_CONFIG=Config_CombatOpsEveronRHSUSMC.json SERVER_PUBLIC_ADDRESS=1.2.3.4 docker compose up

---